Two field experiments were carried out at the village ten, Abu Humus, El-Beheira Governorate, Egypt, during two successive seasons 2016/2017 and 2017/2018, to evaluate effect of three types herbicide irrigation intervals on productivity quality onion cultivar (Giza Red). The designed as split plot in randomized complete block design with replications. Irrigation – (I1) 20 days, (I2) 30 (I3) 40 ...